caBuilder.addExtension(X509Extension.subjectKeyIdentifier, false, extUtils.createSubjectKeyIdentifier(caPair.getPublic()));
caBuilder.addExtension(X509Extension.authorityKeyIdentifier, false, extUtils.createAuthorityKeyIdentifier(caPair.getPublic()));
caBuilder.addExtension(X509Extension.basicConstraints, false, new BasicConstraints(true));
caBuilder.addExtension(X509Extension.keyUsage, true, new KeyUsage(KeyUsage.digitalSignature | KeyUsage.keyCertSign | KeyUsage.cRLSign));
JcaX509CertificateConverter converter = new JcaX509CertificateConverter().setProvider(BC);
X509Certificate cert = converter.getCertificate(caBuilder.build(caSigner));
// confirm the validity of the CA certificate
cert.checkValidity(new Date());
cert.verify(cert.getPublicKey());